jsonValidator

obj := New(`
	 {
	     "code": 1,
	     "message": "test",
	     "data": {
	         "userId": 1,
	 		 "user": {"id": 1, "name": "test"},
	         "id": [1,2,3],
	         "items": [
	             {"id": 1, "name": "a"},
	             {"id": 2, "name": "b"},
	             {"id": 3, "name": "c"},
	             {"id": 4, "name": "d"},
	             {"id": 5, "name": "e"}
	         ]
	     }
	}`)

// float64(1)
val, _ := obj.Value("code")

// int(1)
nVal, _ := obj.Int("code")

// string("test")
val, _ = obj.Value("message")

// map[string]interface{}{...}
val, _ = obj.Value("data")

// map[string]interface{}{"id": 1, "name": "test"}
val, _ = obj.Value("data.user")

// []int64{1,2,3}
val, _ = obj.Value("data.id")

// []int{1,2,3}
arrVal, _ := obj.IntSlice("data.id")

// int64(2)
val, _ = obj.Value("data.id.1")

// []int64{1,2,3,4,5}
val, _ = obj.Value("data.items.*.id")

// []string{"a","b","c","d","e"}
val, _ = obj.Value("data.items.*.name")

print(val, nVal, arrVal)

Output: